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The answer is, "user-defined functions can be written in C (or a language that can be made compatible with C, such as C++). Such functions are compiled into dynamically loadable objects (also called shared libraries) and are loaded by the server on demand. The dynamic loading feature is what distinguishes "C language" functions from "internal" functions - the actual coding conventions are essentially the same for both. (Hence, the standard internal function library is a rich source of coding examples for user-defined C functions.)
Two different calling conventions are currently used for C functions. The newer "version 1" calling convention is indicated by writing a PG_FUNCTION_INFO_V1() macro call for the function, as illustrated below. Lack of such a macro indicates an old-style ("version 0") function. The language name specified in CREATE FUNCTION is C in either case. Old-style functions are now deprecated because of portability problems and lack of functionality, but they are still supported for compatibility reasons."
What else can I help you with?
What is nesting of functions in c language?
Impossibility.
What is the differnce between ordinary function and template function of c language?
The c language does not have template functions. That is a c++ thing.
What is the compound in c language?
compound c language is complicated where we need to use many nested functions and loops
What are the in-built function in c plus plus?
C++ built-in functions are those functions that are provided for you as part of the language itself, and includes all of the C standard library functions (all of which were inherited from C) and is expanded upon by the C++ standard template library. C++ implementors may provide additional functions that are platform-specific, however these are not considered built-in functions becuase C++ is a cross-platform language. These are best described as 3rd party functions. The functions you yourself write are known as user-defined functions.
What is an identifier. what are the hearing rods for identifier 'c' language?
An identifier is the names given for labels, functions and variables in the c language.
What are functions in c language?
constants, MAX_(function), etc.
What enhance the basic instructions of c language?
Library functions
How you describe operations of stack ADT using c template functions?
No, because C does not support the concept of template functions. Template functions only exist in C++, never in C.
How do you convert HTML to c code?
You can't. HTML is a markup language. C is a programming language. You can make C generate HTML, but C isn't anything like HTML in the way it functions.
What does 'C date and time functions' refer to?
C date and time functions refer to a group of functions in the standard library of the C programming language that implements time and date operations like conversion between date formats.
Why dynamic binding is not possible for normal C functions?
Dynamic binding is certainly possible for normal C functions. Binding is a function of the binder (linker) and has nothing to do with the language itself.
What is the difference between c and c plus plus extension?
c language is the structure oriented language and c does not follows the object oriented paradigms . c++ obeys the all object oriented language characteristics ========== C++ is a set of extensions to the C language to allow some (not all) principles of object-oriented programming to be used. Originally, C++ was a front end pre-processor for C and C++ compilers will translate C language functions.
